v3.10.0.1

PERPETUAL CUMULATIVE CONVERTIBALE PREFERRED STOCK (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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Preferred Stock Carrying Value [Abstract] |
Perpetual Convertible Preferred Stock, Value, Issued | $ 0

X
- References No definition available. + Details
Name: | etm_PerpetualCumulativeConvertiblePreferredStock
Namespace Prefix: | etm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | etm_PreferredStockCarryingValueAbstract
Namespace Prefix: | etm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration